Remove unused methods getNodeAt and timestampToIndex.

lib/rga.js

@@ -156,34 +156,6 @@ RGA.prototype = {
     return s;
   },
 
-  // Get the node immediately to the left of the given cursor location.
-  // If line == 0 and column == 0, this returns this.left.
-  getNodeAt: function (line, column) {
-    var l = 0, c = 0;
-    var node = this.left;
-    while (node && (l < line || (l === line && c < column))) {
-      node = node.next;
-      if (!node.removed) {
-        if (node.atom ==="\n") {
-          l++;
-          c = 0;
-        } else {
-          c++;
-        }
-      }
-    }
-    return node;
-  },
-
-  timestampToIndex: function (t) {
-    var offset = -1;
-    for (var node = this.left; node.timestamp !== t; node = node.next) {
-      if (!node.removed)
-        offset++;
-    }
-    return offset;
-  },
-
   _log: function () {
     if (RGA._logging)
       console.log.apply(console, arguments);